I bought the Caiber 48 set. The sections are all solid cast, but the open top ends of the stacks are recessed slightly for some included P/E screens. Cutting and sanding off the large casting plugs from the bottoms of the parts can be tricky keeping everything square and level so that the stacks will fit snugly on their bases without slight gaps. After assembly and fitting them to my Sherman, I realized, from photo reference, that the base sections were not sloped enough to give the stacks the neccessary backwards lean, although, armed with fore-knowledge, this could easily be fixed with bits of styrene. (Maybe there were variations by the manufacturers) In spite of this, they look pretty good and certainly beat scratch-building your own. No decals are included, but from photo reference I've noticed some stencilling on the backs of the stacks.
